XQ2V1000 Datasheet, PDF (16/127 Pages) Xilinx, Inc – QPro Virtex-II 1.5V Military QML Platform FPGAs

QPro Virtex-II 1.5V Military QML Platform FPGAs
R
Figure 13 provides examples illustrating the use of the SSTL2_I_DCI, SSTL2_II_DCI, SSTL3_I_DCI, and SSTL3_II_DCI I/O
standards. For a complete list, see the Virtex-II User Guide (UG002).
SSTL2_I
SSTL2_II
SSTL3_I
SSTL3_II
Conventional
V_CCO/2
R
Z0
R/2
VCCO/2 VCCO/2
R
R
Z0
R/2
V_CCO/2
R
Z0
R/2
VCCO/2 VCCO/2
R
R
Z0
R/2
DCI Transmit
Conventional
Receive
25Ω⁽¹⁾
Virtex-II DCI
V_CCO/2
R
Z0
VCCO
25Ω⁽¹⁾
2R
2R
Virtex-II DCI
VCCO/2
R
Z0
25Ω⁽¹⁾
Virtex-II DCI
VCCO/2
R
Z0
VCCO
25Ω⁽¹⁾ _2R
2R
Virtex-II DCI
VCCO/2
R
Z0
Conventional
Transmit
DCI Receive
VCCO
2R
Z0
R/2
2R
Virtex-II DCI
VCCO/2
R
Z0
R/2
VCCO
2R
2R
Virtex-II DCI
VCCO
2R
Z0
R/2
2R
Virtex-II DCI
VCCO/2
R
Z0
R/2
VCCO
2R
2R
Virtex-II DCI
DCI Transmit
DCI Receive
25Ω⁽¹⁾
Virtex-II DCI
VCCO
2R
Z0
VCCO
25Ω⁽¹⁾ _2R
VCCO
2R
Z0
25Ω⁽¹⁾
2R
2R
Virtex-II DCI Virtex-II DCI
2R
Virtex-II DCI
Virtex-II DCI
VCCO
2R
Z0
2R
VCCO
25Ω⁽¹⁾ _2R
VCCO
2R
Z0
2R
2R
Virtex-II DCI Virtex-II DCI
Virtex-II DCI
Bidirectional
Reference
Resistor
N/A
VRN = VRP = R = Z0
VCCO
25Ω⁽¹⁾
2R
VCCO
2R
Z0
2R
2R _25Ω(1)
Virtex-II DCI
Virtex-II DCI
VRN = VRP = R = Z0
N/A
VCCO
25Ω⁽¹⁾
2R
VCCO
2R
Z0
2R
2R _25Ω(1)
Virtex-II DCI
Virtex-II DCI
VRN = VRP = R = Z0
VRN = VRP = R = Z0
Recommended
Z0⁽²⁾
50 Ω
50 Ω
50 Ω
50 Ω
Notes:
1. The SSTL-compatible 25Ω series resistor is accounted for in the DCI buffer, and it is not DCI controlled.
2. Z0 is the recommended PCB trace impedance.
DS031_65b_112502
Figure 13: SSTL DCI Usage Examples
16
www.xilinx.com
DS122 (v1.1) January 7, 2004
1-800-255-7778
Product Specification